A train travels from A to B at the rate of 20km/hr and from B to A at the rate of 30km/hr,find the average speed.
Jagan went to another town covering 240km by car moving at 60km/hr. Then he covered 400km by train moving at 100km/hr and the rest 200km he covered by bus moving at 50km/hr.The average speed during the whole journey is: